Duh. He was the messiah that was promised to the Jews in the old testament. Christianity is the following of Jesus Christ, part of the fulfillment of the prophecies by God and the new covenant with his people. Jesus came with new promises from God that all were able to achieve salvation through the new plan.
8:6 But now hath he obtained a more excellent ministry, by how much
also he is the mediator of a better covenant, which was established
upon better promises.
8:7 For if that first covenant had been faultless, then should no
place have been sought for the second.
8:8 For finding fault with them, he saith, Behold, the days come,
saith the Lord, when I will make a new covenant with the house of
Israel and with the house of Judah: 8:9 Not according to the covenant
that I made with their fathers in the day when I took them by the hand
to lead them out of the land of Egypt; because they continued not in
my covenant, and I regarded them not, saith the Lord.
8:10 For this is the covenant that I will make with the house of
Israel after those days, saith the Lord; I will put my laws into their
mind, and write them in their hearts: and I will be to them a God, and
they shall be to me a people: 8:11 And they shall not teach every man
his neighbour, and every man his brother, saying, Know the Lord: for
all shall know me, from the least to the greatest.
8:12 For I will be merciful to their unrighteousness, and their sins
and their iniquities will I remember no more.
8:13 In that he saith, A new covenant, he hath made the first old. Now
that which decayeth and waxeth old is ready to vanish away.
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Shima y Israel Jehovah Elohym Jehovah echad.